Fuse



R. FOGAL FUSE Filed April 10 1931 2 Sheets-Sheet l 1932- J. R. FOGAL 1,874,948

Filed April 10, 1931 2 Sheets-Sheet 2 @IHIHTIHHWQ e wmmgmnwly gwntoz Patented Aug. 30, 1932 u? a. roan, or am ramcrsco, earn-am susn Application filed April 10,

I This invention relates to fuses and is directed more particularly to electrical fuses embodying venting means to permit the gases to escape when the fuse link melts.

' The primary object of the present invention is to provide a novel and 1m roved fuse construction embodyin venti atin passages of suflicient lengt to effective y cool the gases before they are dischar ed to the atmosphere and thus reduce the re hazard to a minimum.

Another object is to provide a fuse of this character whlch shall consist of few-parts 'that are simple in construction and inexpen 15 sive to manufacture and which may be easily and quickly assembled.

With these and other objects in view, the invention may be stated to consist in the-various novel features of construction and arran ement or combination, all of which will be ully described hereinafter and pointed out in the appended claims.

r In the drawings accompanying and forming a part of this application, 2,

25 ig. 1 is a view artly in section and partly in elevation ofa use constructed in accor ance with my invention;

' Fig. 2 is a plan view of a lock washer employed in my fuse construction;

80 Fig. 3 is a bottom plan view of one of the end cups; I g

Fig. 4 is a sectional view taken on the line 4-4 of Fig. 3;

Fig. 5 is a planview of one of thedisks 85 employed in my fuse construction;

Fig. 6 is a sectional view taken on the line 6 6 of Fig. 5; a Fig. 7 is. asectional view of the innermost disk; and

Fig. 8' is a fragmentary sectional view'of a modified form of construction. Referring to the form of fuse illustrated in Fig. 1, 1 denotes the body portion which'is preferably cylindrical in from insulating material.

shape and formed Positioned with-.

1931. some in. 529,181. I

in each end of the body portion is a cup shaped member 2 having an internal thread 3 and a tortuous groove 4 formed in the end wall thereof. A knife blade contact 5 having a reducedortion 6 that is formed with a serrated surace rojects through an aperture 7 in the cup s aped member and the edges defining this aperture are serrated as clearly shown in Fig. 4' so that a snug fit-is insured betweenthese elements. Disposed within the cup shaped member 2 are a pair of disks 9 and 10 WlllCh are formed with serrated openings 11 and 12 respectively to interfit with the serrated surface of the knife blade con-* tact. The peripheral edges of these disks are enga d with the internal thread 3 of the mem er 2 and define a spiral vent passage 13. From the fore oing descrgition, it W111 be apparent thatt ecup sha e member 2, disks 9 and 10, and knife bla e contact 5 form a unit assembly. o

The disk 9 is formed on opposite faces thereof with tortuous grooves 14 and 15 which are similar to groove 4, and in a sim-' ilar manner one face of disk 10 is formed 1 with a tortuous groove 16. The grooves 4.- and 14, and grooves 15 and 16 cooperate to form a vent assage which communicates at the inner en through lateral ports 17 with 75 the spiral assage, 13. Communication is established etween irooves 15, 16 and 4, 14 by a fport 18 in dis 9 adjacent the inner end 0 the groove 15. The cup sha ed member 2 is formed with a port 19 whic extends to v from groove 4 through the end wallthereof.

This member is also formed with ports 20 which extend through the end wall thereof and communicate with the spiral passage formed by internal thread be Closely embracin the knife blade contact is a lock washer 22 ormed of two halves ivoted to ether at 23 and to the fuse body. he ends 0 these halves overla at 24 and lie in the same plane. A cap 25 is threaded on the II I I. grooves. or pass end of the b lock washer.

g1 portion 1 and encloses the sea the atmosphere and with the space between the lock washer and-cup shaped member-2.

A fuse link 27 ofany suitable type inter connects the knife blade contacts.

- In use, when fuse link 27 melts, the gases generated are vented at each end of the fuse y passing through spiral passage 13 and ports 'and 26 to the atmosphere. Venting is also accomplished by some of the gases in s' iral passage 13 passing through ports 17 once grooves 15, 16 and port 18 to grooves u 4, 14 and ports 19 and 26 to the atmos here.

In assembling the fuse each cup s aped member 4 is pressed on the reduced portion 1 6 of the knife blade contact and the disks 9 7 so 30 having :1. rolled threaded portion defining an interior spiral passage 31 and an exterior spiral assae 32. In this form of my invention I ave lllustrated three disks 33, 34 and 35 which have intercommunicating tortuous es'36 similar tothose described in connection with disks 9 and 10. In other respects the fuse construction is similar to that previous] described in connection with Fi 1. In ig. 8, a portion ofthe I gases as t rough exterior spiral passage 32 an through ports 26 to the atmosphere. Gases also pass through interior spiral passage 31 thence through the tortuous passages 36 in the-disks and orts 26 to the atmosil phere. This form 0 fuse is assembled and J reassembled to renew the fuse link in the same manner as described in connection with Vhat I claim is:

1. A fuse of they character set forth comrising a body portion, a cup shaped memr positioned in each end of said body portion and having an internal thread, a disk positioned withln each cup shaped member and engagingsaid thread to define. a spiral passage,s aid disk-having a. tortuous passage therein, and means. connecting said spiral passage and tortuous passage with the at mosp ere.

2. A fuse of the character set forth com- 7 rising a body portion, a cup shaped mem r positioned iii' each -endof said body por-' tion andhaving an internal thread, a plushaped' member and having their peripheral is'provided with a plurality of ports 26 w 'ch communicatewith.

rality of disks positioned within each cup edges engaging said thread to define a spiral passage, said disks having grooves in the faces thereof and the adjacent faces of said disks being in engagement to define a tortuous passage, and means connecting said passages with the atmosphere.

3. A fuse of the character set forth comprising a, body portion, a cup shaped member positioned within each end of said body portion,-a plurality of disks positioned within each cup shaped member, said disks having grooves in the facesthereof and the adj acent faces of said disks being in engagement to define a tortuous passage, and said passage communicating at one end with the interior of said body portion and at the other end with the atmosphere.

4. A fuse of the character set, forth comprising a body portion, a cup shaped member positioned within each end of said body portion, aknife blade contact projecting through I each cup shaped member, a fuse l1nk interconnecting said contacts, means positioned within each .cup shaped member and defining an elongated vent passage communicating with the interior of said'body ortion,

a lock washer surrounding each kni e blade I contact, and a cap enclosing said lock washer and engaged with said body portion, said cap having ports communicating with said vent passage and the atmosphere.

5. A fuse of the character set forth comprising a body portion, a knife blade contact projecting from each end'of said body portion, a fuse link interconnecting said con-' tacts, a plurality of disks positioned within each end of said body portion and interengaged with the respective lmife' blade contact, saiddisks cooperating with eachother to define ventilating passages communicating with the interior of said body portion, a

a cap enclosing each lock-washer and engaged with said body portion. said caps having ports communicating with said ventilating passages. s

6. A fuse of the character set forth comprising a body portion, a knife blade contact pro ecting from each end of'said body portion, a fuse link interconnecting said contacts, a plurality of disks positioned Within each endof'said body'portion and interengaged with the respective knife blade contact,

define ventilating passages communicating said disks cooperating with each other to lock washer surrounding each contact,'and

with the interior of, said body portion, ad-

ditional vent means communicating with the interior of said body portion. a-lock washer surrounding each contact, and a cap enclosand with said additional vent means.

7. A unit assembly, for a fuse comprising a cup shaped member, and a knife blade coning eachlock washer and engaged with said body portion, said caps having ports'communicatmg with said ventilating passages tact projecting through said cup shaped member, said contact and member having 'interengaging serrated surfaces.

8. A unit assembly for a fuse comprising 5 a cup shaped member, a knife blade contact projecting through said cup shaped member,

a plurality of disks engaged over said con tact and positioned within said member, said disks, member and contact having interenm gaging serrated surfaces.

In testimony whereof I aflix my signature.

JAY R. FOGAL. 

